Mercedes-Benz 2008 R 320 CDI 4MATIC Operator's Manual page 279

Controls in detail
Driving systems
Warning!
Make sure that no one is near the wheel
housing or under the vehicle when you lower
the vehicle while it is standing still. Limbs
could become wedged into or under the
vehicle.
For safety reasons, the vehicle can only be
lowered with all doors and the tailgate
closed. Lowering is interrupted if a door or
the tailgate is opened and will continue after
the door is closed again.
Warning!
Adapt your speed and driving to possible
changed driving behavior of the vehicle after
changing the vehicle level. The ESP
prevent accidents, including those resulting
from excessive speed. The ESP
prevent the natural laws of physics from
acting on the vehicle.
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!
Keep in mind that in rough or uneven roads,
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adjusting the vehicle to a lower level may cause
the vehicle underbody to come in contact with
the road and result in damage to the vehicle un-
derbody. Always make sure the vehicle has suffi-
cient ground clearance before adjusting it to a
lower level.
!
Before jacking up the vehicle with equip-
ment that lifts one or more of the wheels com-
pletely off the ground, remove the SmartKey
from the starter switch.
!
Please also note the information in the
section on towing ( page 513).
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The activation threshold is defined by the set
suspension tuning ( page 276).
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Basic settings
There are two settings from which to
choose:
®
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Raised level, for driving on rough roads
®
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Highway level, for driving on paved
roads in fair or better condition
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The third available level is the highspeed
level that is set automatically.
The vehicle's ride height changes by the
approximate values given in table below
according to the set level:
Level Ride height
Raised + 1.97 in (+ 50 mm)
Highway +/- 0
Highspeed - 0.78 in (- 20 mm)
The vehicle lowers to highspeed level
automatically when
the vehicles speed exceeds
70 mph (112 km/h)
the vehicles speed is between
60 mph (96 km/h) and
70 mph (112 km/h) for longer
than 20 seconds
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Obey local speed limits. Use prudent driving
speeds appropriate to prevailing conditions.